Adding a child node to XML in flex

In a Flex application, I'm have an xml object that I'm binding to a tree control. I'm able to add a child node to the xml but when I try to add a child to the child node it doesn't appear on the tree control

tree =  <node label="Root">
                  <node label="Category 1"/>
                  <node label="Category2"/>
                  <node label="Category3"/>
                  <node label="Category 4">
                   <node label="SubCategory4.1"/>
                   <node label="SubCategory4.2"/>
                  </node>
              </node>;           
      var someNode:XMLNode = new XMLNode(9, 'Category5');   
      var aSubNode:XMLNode = new XMLNode(9, 'SubCategory5.1');
      someNode.appendChild(aSubNode);               
      tree.appendChild(someNode);

So Category5 appears on the tree control but SubCategory5.1 does not. What am I missing?

From stackoverflow

• If you are using flex, use AS3. XMLNode is AS2. In short, try this:

  tree = <node label="Root">
             <node label="Category 1"/>
             <node label="Category2"/>
             <node label="Category3"/>
             <node label="Category 4">
                 <node label="SubCategory4.1"/>
                 <node label="SubCategory4.2"/>
             </node>
         </node>;
  var someNode:XML = <node label="Category5"/>;
  var aSubNode:XML = <node label="SubCategory5.1"/>;
  someNode.appendChild(aSubNode);
  tree.appendChild(someNode);
  

  philcruz : That works! Thanks!